<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>

  <input type="text" id="username" placeholder="请输入用户名" />
  <button id="enter">进入聊天室</button>
  

  <script src="js/entry.js"></script>
</body>
</html>